/Engine/Source/Runtime/Engine/Public/Animation/AttributesRuntime.h
Blend custom attribute values from N set of inputs, using N number of blend samples
static void BlendAttributesPerBone ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FStackAttributeContainer](API\Runtime\Engine\Animation\FStackAttributeContainer) > SourceAttributes, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const int32 > PerBoneInterpolationIndices, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FBlendSampleData](API\Runtime\Engine\Animation\FBlendSampleData) > BlendSampleDataCache, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const int32 > BlendSampleDataCacheIndices, [FStackAttributeContainer](API\Runtime\Engine\Animation\FStackAttributeContainer) & OutAttributes )